<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
    </el-card>

    <el-table :data="rolelist" border stripe>
      <!-- 展开列 -->
      <el-table-column type="expand">
        <template slot-scope="scope">
          <el-row
            :class="['borderBottom', i1 === 0 ? 'borderTop' : '', 'vcenter']"
            v-for="(item1, i1) in scope.row.children"
            :key="item1.id"
          >
            <!-- 渲染一级权限 -->
            <el-col :span="5">
              <el-tag>{{ item1.authName }}</el-tag>
              <i class="el-icon-caret-right"></i>
            </el-col>
            <!-- 渲染二级和三级权限 -->
            <el-col :span="19">
              <!-- 通过for循环 嵌套渲染二级权限 -->
              <el-row
                :class="[i2 === 0 ? '' : 'borderTop', 'vcenter']"
                v-for="(item2, i2) in item1.children"
                :key="item2.id"
              >
                <el-col :span="6">
                  <el-tag type="success">{{ item2.authName }}</el-tag>
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <el-col :span="18">
                  <el-tag
                    type="warning"
                    v-for="item3 in item2.children"
                    :key="item3.id"
                    closable
                    @close="removeRightById(scope.row, item3.id)"
                    >{{ item3.authName }}</el-tag
                  >
                </el-col>
              </el-row>
            </el-col>
          </el-row>
          <!-- <pre>{{ scope.row }}</pre> -->
        </template>
      </el-table-column>
      <!-- 索引列 -->
      <el-table-column type="index"></el-table-column>
      <el-table-column label="角色名称" prop="roleName"></el-table-column>
      <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
      <el-table-column label="操作">
        <template slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete">删除</el-button>
          <el-button
            type="warning"
            icon="el-icon-setting"
            @click="showSetRightDialog(scope.row)"
            >分配权限</el-button
          >
        </template>
      </el-table-column>
    </el-table>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      @close="setRigthDialogClosed"
      width="50%"
    >
      <el-tree
        :data="rightslist"
        :props="treeProps"
        show-checkbox
        default-expand-all
        node-key="id"
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <el-button @click="setRightDialogVisible = false">取消</el-button>
      <el-button type="primary" @click="allotRigths">确定</el-button>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //所有角色列表数据
      rolelist: [],
      //控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // setRightDialogVisible=false 错误的
      rightslist: [],
      //树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        chilidren: 'children'
      },
      //默认选中的三级结点Id值数组
      defKeys: [],
      //当前即将分配权限的角色id
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    //获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')

      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }

      this.rolelist = res.data
      console.log(this.rolelist)
    },
    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
      // 点击后先来一个弹框，判断用户是否删除，
      const confirmResult = await this.$confirm(
        '此操作将永久删除该文件，是否继续？',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (confirmResult != 'confirm') {
        //如果选择了取消后面的代码将不再执行，因为已经return出去了
        return this.$message.info('取消了删除')
      }
      // console.log('你选择了确认删除')
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )

      // 失败
      if (res.meta.status != 200) {
        return this.$message.error('删除权限失败!')
      }
      role.children = res.data
    },
    //展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      //先看能否获取到数据，获取不到的话就不展示对话框了
      const { data: res } = await this.$http.get('rights/tree')

      if (res.meta.status != 200) {
        return this.$$message.error('获取权限数据失败！')
      }

      this.rightslist = res.data
      console.log(this.rightslist)

      // 递归获取三级节点 的Id
      this.getLeafKeys(role, this.defKeys)

      this.setRightDialogVisible = true
    },
    //点开分配权限的时候，默认勾选三级权限已有权限的功能 封装函数：
    getLeafKeys(node, arr) {
      //如果说没有children 的话就表明是 最后的三级权限
      if (!node.children) {
        return arr.push(node.id)
      }

      // 如何改写成回调函数呢？
      // node.children.forEach(function(item, arr) {
      //   this.getLeafKeys(item, arr)
      // })

      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    //监听分配权限对话框的关闭事件
    setRigthDialogClosed() {
      this.defKeys = []
    },
    //点击确认按钮的时候 为角色分配权限
    async allotRigths() {
      //先获取选中状态和半选中状态的id
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join()

      // 发请求修改状态
      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        {
          rids: idStr
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }

      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.borderTop {
  border-top: 1px solid #eee;
}
.borderBottom {
  border-bottom: 1px solid #eee;
}
//交叉轴方向上：居中对齐
.vcenter {
  display: flex;
  align-items: center;
}
</style>
